The geometry of Wolf-Rayet nebulae is a long-standing problem and still rather
unexplored mystery. All except one simulation performed to date predict
their appearance to be both spherical and affected by hydrodynamical instabilities
originating from the evolved Wolf-Rayet stellar wind, blown into the interior of its
own main-sequence stellar wind bubble and interacting with the shell generated during its
previous, e.g. red supergiant, evolutionary stage [1]}, [2]}, [3]}, [4]}. All these models assume a static
massive star undergoing a succession of isotropically-launched stellar winds.
As discussed above, a cool, dense stellar wind launched along the equator of
the star can make the Wolf-Rayet nebula strongly anisotropic, shaping the outflow
as a bipolar structure. The physical origin of the equatorial
stellar wind is so-far included as sub-grid models in the few simulations run so far,
see [5]}. Our study is therefore the first work continuing
that on asymmetric Wolf-Rayet nebulae of [5]}.
